![]() The conflict can be avoided by maintaining a clean git history. Github defaults to the former display, whereas the latter is more typically useful for fishtesters. Two dotted diff aka literal diff: full diff between two specific commits, ignoring ancestry (usually what is intended for a fishtest test).Three dotted diff aka ancestry diff: diff between one commit and a common ancestor, useful to see the effects of a merge.This has to do with the fact that git has two different ways of comparing commit ranges, "double dot" and "triple dot". This is generally caused by the new tag and base tag sharing common code which was introduced in uncommon ancestor commits. This may happen with complicated git commit histories, most commonly with tests against a base other than master. in the branch field of the test submission page at. If your branch name is passed_pawn, you can enter passed_pawn^, passed_pawn^^. Patches that add/remove a concept/idea/feature shall pass individually. Each patch shall be trivial, like a parameter tweak.Due to the nature of the approach and because each individual patch failed already, a union has some constraints: Sometimes retesting the union as a whole passes SPRT. What is a union patch?Ī union is the bundling of patches that failed SPRT but with a positive or near-positive score. For various reasons, please base your tests on the current SF master. Giving lucky tries too much of a chance to pass. It's a good balance between exploring the change and not Generally, four or five tries is the limit. If you find a tuning that looks good, you can then schedule a two-stage SPRT test. You can use the NumGames stop rule, with 20000 games TC 10+0.1, and schedule a few tests around theĭirection you want to tune in. The threshold is calculated based on the two parameters given to the test (please read the paragraph " Testing methodology" on the page Creating my first test for details). ![]() The test is terminated when the value is below a lower-bound threshold or above an upper-bound threshold. Essentially, we run matches sequentially, for each match we update a value from a likelihood function. The parameters of the test control the Type 1 and Type 2 errors. With SPRT, we can test the hypothesis with the least expected number of games, that is, we don't attempt to fix the number of games to be played. ![]() In SPRT, we have a null hypothesis that the two engines are equal in strength, while an alternative hypothesis is that one of the engines is stronger. SPRT stands for sequential probability ratio test. Selecting the type of test according to the stage you are in will configure all the necessary options for you. Most tests should use the two-stage approach, starting with stage 1, and if that passes, using the reschedule button to create the stage 2 test. What time-control/method should I use for my test? You can look at the test's history, and follow the corresponding link on the left of Fishtest's main view. You should first check if the test has not been run previously. The following questions are more technical and aimed at potential Stockfish developers: Can I program or run any test I want? If this happens on a regular basis for a particular worker then this may be some cause for concern. However, if the deviation is exceptionally large then the residual will be colored yellow or even red. Small deviations are normally just due to statistical fluctuations and these will be colored green. It is a measure of how far the worker deviates from the average. Therefore for each worker, a "residual" is shown on the overview page of every test. The statistical models that Fishtest uses are based on the assumption that the pentanomial probabilities (a variation on the win, loss, draw probabilities) are the same for each worker. Four LTC games (which are less common) represent about 12 minutes of work. Four STC games for a 1 core worker represents about 2 minutes of work. ![]() So on average, you can expect to lose four games when quitting the worker.
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